Printing-press.



' 0. A. McCAIN.

Patented May 8, 1917.

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PRINTING PRESS.

APPLICATWN man JAN. 12. 1916.

Patented May 8,1917.

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CYRUS A. MCCAIN, 0F BENSQNHURST, NEW YORK.

PRINTING-PRESS Specification of Letters Patent.

Patented May 8, 1917.

Application filed. January 12, 1916. Serial No. 71,705.

To (ZZZ UZLUNL it may concern:

Be it known that I, Cvnr's A. lVIUCATN, a citizen of the United States,residing at Bensonhurst, in the county of Kings, State of New York, haveinvented certain new and useful Improvements in PrintingPresses, ofwhich the following is a specification.

The present invention relates generally to printing presses which employa rotary sheet-carrying cylinder, and more particularly to the variousmechanisms for guiding and engaging the sheet of paper to hold it uponthe cylinder during its rotations and to free it therefrom at the propertime, as will more fully appear hereinafter.

The various features of my invention may be used in connection withpresses of many different types. In the present instance I have chosento disclose my invention in connection with a flat bed cylinder press ofthe type in which a rotary impression cylinder cooperates with a flattype bed, the cylinder being moved toward and from the bed as the latteris reciprocated. A clearer understanding of the features of theinvention as herein embodied, may be had if it is kept in mind that insuch presses two revolutions of the impression cylinder are necessary toprint a single sheet; that the delivery of the sheet to the cylinder,the printing of it and the starting of it from the cylinder. areaccomplished in a little more than one revolution of the cylinder, thatis. during a rotary movement including the first revolution and a smallportion of the second, and that during the balance of the secondrevolution tl e cylinder is free of a sheet and the bed is on the return'stroke.

In the accompanying drawing, Figure 1. is an end elevation of a flat bedprinting press impression cylinder and associated sheet-handlingmechanism constructed in accordance with my invention; Fig. 2 is a planview of a portion of said cylinder and mech anism; Fig. 3 is afragmentary transverse section of a portion of the cylinder, the planeof section being indicated by the line of Fig. 4:, Fig. l is afragmentary plan view of the cylinder illustrating other parts of thesheet-controlling mechanism; Figs. 5 and 6 are detail views of differentparts of a 'ng-actuated gripper pin; Fig. 7 is a view similar to aportion of Fig. .4, illustrating particularly the tumbler and itsactuating pin in position to throw the tumbler; Fig. 8 is a. viewsimilar to Fig. 7, but showing the pin in its retracted position; Fig. 9is an elevation of a portion of the cylinder showing the tumbler and thegripper pin in a position corresponding to that of Fig. 7;

and Fig. 10 is a similar viewillustrating the application from whatwould have been otherwise necessary.

Referring to the drawings in detail, 10 designates a portion of anupright extension of the main frame of a press upon which one of thejournal boxes 11 of the impression cylinder 12 is located. Acorresponding extension and journal box is located at the other end ofthe cylinder in the usual manner. The extensions 10 carry uide rodframes 13 and these guide rod rames are connected by a transverse dropguide bar 14-, a. feed guide rod 15, a stripper finger rod 16, and aconveyor shaft 17. As shown in Fig. 4, the cylinder 12 is provided witha hollow interior cavity 18 in which are located the usual gripper shaft19 and shoo-fly finger rod 20. The shaft 19 carries the usual. grippers21, and the rod 20 carries the usual lifting or shoo-fly fingers T hegrippers 21 cooperate with the adjacent edge of the cylinder to hold thesheet while the fingers 22 pass beneath the sheet and at'the appropriatetime lift the edge of it from the cylinder to be engaged by thestripping fingers 23 located upon the stripping finger rod 16. Thegripper shaft 19 is provided with a tumbler 2% which cooper ates with apair of gripper pins 25, 26, to hringabout a proper actuation of thegrippers 21. The guide rod 14 carries the usual drop guides 27 and. thefeed guide rod 1.5

its forward end a cam roller 33 which travels upon a cam 34 which issecured to the gear wheel 35 mounted upon the journal of the cylinder.A. spring pressed pin 36 is mounted upon the loose arm 32 and is movableunder its spring pressure, when unrestrained, to pass beneath the outerend of the fixed arm 31. By this construction the arms 31 and 32 arecoupled together and as the arm 32 is raised at its outer end, the arm31 is likewise raised to rock the guide rod 15 and raise the guides 28located upon it. In order to actuate the pin 36, a member 37 is pivotedto the outer end of the loose arm 32 and arranged to engage at its freeend in a notch 38 cut in the side of the pin 36. A cam face 39 is formedat the lower edge of the member 37 to provide for its actuation ashereinafter explained. The stripping finger rod 16 is provided with anarm 40 and the outer end of this arm is connected by a spring 41 to afixed portion of the guide frame 13 so as to normally hold the strippingfingers 23 down in position to strip the sheet from the cylinder. Themovement of the arm 40'and rod 16 in the opposite direction, is broughtabout by means of a link 42 which is connected to the outer end of thearm.

In the operation of these parts the sheet the cylinder rotates, thegrippers hold on to the sheet and carry it around to be printed. Thesheet continues in engagement with'the cylinder until the tumbler 24 ofthe gripper shaft 19 comes into engagement with the opening pin 26 whichhas in the meantime been thrown into tumbler engaging position while thegripper closing pin 25 has been thrown out of tumbler engaging position.As the sheet is thus carried about the cylinder, the stripper fingers 23are elevated. At the time the opening pin 26 engages the tumbler torelease the sheet, the stripper fingers 23 are lowered and just beforethe sheet reaches the stripper fingers, the shoofiy fingers 22 lift theedge of the sheet on to the points of the stripping fingers 23.

From the latter the sheet is delivered to the conveyer 83. It will benoted that the sheet is held upon the cylinder by the grippers for onecomplete revolution and a portion of a second revolution, and that thesheets are fed every second revolution of the cylinder. The portion ofthe second revolution during which the sheet is held by the grippers, isequal approximately to the distance between the gripper pins 25 and 26.

The gripper pins 25, 26, the guide bar actuating link 30, the stripperbar actuating link 42, and the cam member 37 for actuating the couplingpin 36 to bring the front feed guides into operation, are all operatedby means of a reciprocating bar 43 which moves to and fro upon a guidebar 44 which is fixed to the guide frame 13. The employment of this bar43 to actuate the gripper and otl er mechanisms, constitutes an im- 5portant feature of my invention. This reciprocating bar is actuated bymeans of a bell crank lever 45 which is pivoted at 46 to a. portion ofthe guide frame 13 and is provided at its opposite end with an elongatedshoe 47 whichengages a cam track located upon the one face of the wheel35, which comprises an inner portion 48 and an outer portion 49 whichcome together, as clearly illustrated in Fig. 1. During one 5 revolutionof the cylinder the shoe 47 travels in the inner-cam track 48, andduring a second revolution it travels in the outer cam track 49. By thisconstruction the reciprocating bar 43 is moved to one end of itsmovement as the shoe passes from the inner track 48 to the outer track49, and to the other end as it passes from the outer track 49 to theinner track 48. To provide for proper action between the bell cranklever 45 and the reciprocating bar 43, the latter is provided with aslot through which the end of the-bell crank lever extends and that endof the bell crank is curved so as to provide a sort of ball-and-socketconnection with the bar.

The bar 43 is provided at its opposite ends with oppositely inclinedslots 50 and 51, the former being associated with-gripper pin 25 and thelatter with gripper pin 26. In each instance these gripper pins are madeup of an outer sleeve 52 and an inner pin 53. The former is provided atone end with a slot 54 and the latter with a similar slot 55.

hese slots are made for the purpose of embracing the adjacent end of thereciprocating bar 43. A pin 56 holds the parts together. For thispurpose it passes through slots 57 of the inner pin member 53 andthrough the inclined slot 50 or 51 of the bar It is firmly held inposition by being secured at its ends to the outer pin member 52. Byreason of the slot 57, the inner pin member 53 is movable relative tothe outer sleeve 52. In order to hol e p rts distended, that is, in theposition illustrated in Figs. 7 and 8, the inner pin member 53 isprovided with a central cavity or here 58 of a diameter approximatelyequal to the width of the slot 55, and this bore terminates in a smallerbore 59, as clearly illustrated in Fig. 6. A pin 60 having a head 61,fitted into the smaller bore 59, and a spring 62- is coiled about thepin and lies 1 within the bore 58, bearing at one end against the pinhead 61 and at the other end against the end of the bore 58. lVhen theparts of the pin are assembled upon the re ciprocating bar l3. the head(51 of the pin bears against one edge of the bar l3 and thereby forcesthe inner pin member 53 away from the bar 4L3 until the pin 56 engagesthe end of the slot 57, as illustrated in Fig. 7. The completelyassembled gripper pins 25, 26, are mounted in bearings 33 formed in theguide frame member '13, as clearly illustrated in Fig. 4. They arearranged to cooperate with the tumbler 2t usual.

The gripper tumbler is provided with two oppositely disposedpin-engaging slots (i l and 65 which are separated by a centralinterposed partition 66. The portion of the tumbler in which the slot 6%is located is shorter than that in which the slot 65 is located, andconsequently the end of the latter is farther from the center ofrotation of the tumbler. This difference in length is provided so as toenable the longer end to engage the usual stop pins 67 and 68 upon theadjacent portion of the cylinder as the tumbler is rotated back andforth between the positions of Figs. 9 and 10. This to-and-fro rotationof the tumbler is brought about by the gripper pins 25 and 26 engagingthe slots of the tumbler in a manner well known in this art. In additionto the slots 64: and the tumbler 2st is provided with central convex,preferably conical, faces 69 and 70, which cooperate with pins 25 and 26to prevent breaking the latter in case the tumbler is not in the properposition, as sometimes occurs when the pressman is turning over thecylinder preparatory to putting the press in operation. In normaloperation the closing pin 25 enters the slot 64:, and the opening pin 26enters slot 65, in the manner illustrated in Fig. However, if thetumbler should not be in pin-receiving position,

that is, in position for the appropriate gripper pin to enter theappropriate slot 64 or 05. but in a position such as that illustrated inFig. 10 then the inner member 53 of the pin upon engaging the inclinedconical face 69 or 70 of the tumbler, would be pressed back by thelatter against the pres sure of its spring 62, in the manner illustratedin Fig. l, and would ultimately pass out of engagement with the tumblerwithout being broken. This tumbler and pin eonstruction constitutes anin1 )ortant feature of my invention.

As the reciprocating bar a3 is moved back and forth, the relativepositions of the outer and inner members 52 and 53 of the pin do notchange so long as the inner member 53 does not engage one of theinclined faces of the tumbler, but the pin as a wholemoves back andforth in its bearing 63, as clearly illustrated in Figs. 7 and 8. Underthese conditions the pin 56 of the gripper pin structure remains alwaysin engagement with the outer end of the slot 54 of the inner pin member53, while the position of the bar 43 in the slots 5-l and 55 of the pinmembers raries, as will be apparent from a consideration of Figs. l, 7and 8.

The grippers 21 are of the usual construction and are sleeved upon thegripper shaft 19 and held in proper position by set-screws 7l. They areyieldingly held either in closed position or in wide open position bymeans of the usual spring toggle construction in which an arm 72securely clamped to the shaft 19 by bolts 73, is pivotally connected atits outer end to one end of a rod 7 at which passes through an eye-bolt75 secured to a suitable point in the interior of the cylinder and inwhich a spring 7 6 acts between the eye-bolt 75 and a collar 77 upon therod 74-. The compression of the spring 76 may be varied by shifting thecollar 77 upon the rod in a well known manner. .Vith this constructionthe parts are so positioned that the pivotal connection between the arm72 and rod 7% will lie on either side of a plane through the shaft 19and the eye-bolt 75. This is the usual construction for this purpose andneed not be further illustrated. It is practically identical with thatshown in Fig. 8 of the aforesaid Miehle patent. From this description itwill be seen that in operation, when a gripper pin, such as 25, en gagesone of the slots of the tumbler 24:, the latter will be rotated so as toshift the pivotal connection between the arm 72 and the rod 7-ibcyondcenter, and thereby allow the spring 76 to complete the movement of thegripper shaft 19. The stop pins 67, 68, of course limit the movement ofthe shaft 19 in either direction.

The reciprocating bar l3 serves to actuate the drop guides by means of aprojection or block 78 located upon its upper surface and arranged toengage the free end of the link 30 carried by the arm 29, as before eX-plained. As the bar 4-3 moves to the left, viewing it as shown in Fig.1, the arm 29 and lingers 27 are raised. As the bar moves to the right.the corresponding parts are low ered. This lowering movement is limitedby the engagement of a stop pin 79 with the upper face of the hub of theloose arm 82 upon rod 15 previously referred to. This stop pin 79 is inthe form of a screw threaded through a boss upon the arm 29 and held inadjusted position by means of a lock-nut 80.

The stripper fingers 23 are moved out of sheet-engaging position bymeans of a similar block or projection 81 upon the reciprocating bar 43,which is arranged to engage the free end of the link 42. When the bar 43is moved to the right, as viewed in Fig. 1, the projection 81 bypressing upon the link 42, rocks the stripper finger rod 16 against thepressure of the spring 41, and thereby raises the stripper fingers 23.4s the reciprocating rod moves in the opposite direction, the spring 41causes a return of the stripping fingers. The arm 40 is secured upon theshaft 16 in desired position by aset-screw 107.

The projection 31 upon the reciprocating bar 43 also cooperates with thecam face 39 upon the cam member 37 by which the clutch pin 36cooperating between the fixed and loose arms 31 and 32 upon the rod 15,couples them together so as to act 1H response to the movements of theloose arm 32. As the bar 43 is moved to the left, as viewed in Figs. 1'and 2, the projection 81 by moving along the cam face 39, allows thespring pressed member 37 to move the pin 36 against the tension of itsspring out of engagement with the fixed arm 31 and thereby allows thefeed guides 28 to be lowered. Its movement in the opposite directiondepresses the cam member 37 against the tension of its own spring andallows the spring of the pin 36 to force the latter into engagingposition, with the result that as the loose arm 32 is raised at itsouter end, the fixed arm 31 will also be raised and the rod 15 rocked toraise the guides 28.

In the preferred construction I employ sheet guides or brushes 82, whichare hung upon a transverse rod 82" extending between extensions 82 ofguide rod frames 13. These brushes 82 engage the sheet to hold itagainst the cylinder as the latter carries it around. 7

When the sheet is stripped from the cylinder by the stripping fingers23, it is carried upon conveyer tapes 83 which pass over conveyer wheelsmounted upon the conveyer shaft 17. This shaft is preferably driventhrough a train of gearing from the large cylinder gear wheel 35. Thistrain of gearing includes a gear wheel 85 keyed to the shaft 17 andmeshing with a gear wheel 86 keyed. to a stud 87 upon which the gearwheel 88 is also keyed. This latter gear wheel is in line with the gearwheel 35 and is adapted to be driven from it. The conveyer constitutesno part of the present invention and is only incidentally shown. This isalso true of the sheet guides 82.

The lifting fingers 22 are of the usual construction and they areprovided with hubs which are mounted on the Sh o-fly shaft 20 and heldin position by set-screws 90 in the usual way. This shaft 20, however,is arranged so that the fingers 22 may be thrown up by hand into aposition where the other parts of the mechanism in the interior of thecylinder may be readily inspected or be rendered more accessible to theoperator. It is also divided into sections and so arranged that thatsection which contains the fingers may be readily removed from thecylinder by hand. For this purpose I divide the shaft into a shortsection 91 which extends only through the adjacent end web of thecylinder and a longer section 92 which extends practically throughoutthe length of the opening 18 in the cylinder. It is upon the lattersection that the fingers 22 are mounted. The end of the shaft section 92enters a small bearing cavity 93 in the end web distant from the section91 so that it may be readily slipped into and out of said bearing. Theother end of the section 92 is provided with a coupling member 94 whichcooperates with a coupling member 95 upon-the adjacent end of thesection 91. These coupling members are rigidly secured to theirrespective sections by pins 96, 97, and a spring pin 98 cargers may beremoved by drawing upward upon the end of the section adjacentto thecoupling and then withdrawing the other end from its bearing 93. Theouter end of the shaft section 91 is provided with the usual shoe-flylever 99 and associated carnroller l00. These cooperate with the shoofiycam 101 which is suitably pivoted upon a transverse shaft 89 whichextends between and is supported by the guide frames 13.

A leaf spring 102 secured to a pin .103 upon one end of the cylinder 12,bears at its free end against the outer end of the cam lever 99 andtends to hold the latter against a stop pin 104 located in the adjacentend of the cylinder 12. A similar pin 105 positioned below the spring102 and nearer to its supporting pin 103, serves to prevent unduedownward flexure of the spring 102. The construction by which the shaft20 and fingers 22 may be removed from the cylinder, or, in thealternative, the fingers rocked so as to give access to the parts withinthe fly shaft 20 may be of any desired construction. Preferably,however, I locate a cam stop 106 upon the shaft 16 and just inside of headja nt fr 1 Wh n the t pping fingers 23 are elevated and the sheet ispassing around to be printed, the stop 106 is rotated by the link 12 soas to clear a stop 10S upon the cam 101. This is the position shown inFig. 1 in full lines. As a result, the cam 101 swings outward aboutshaft 89 by reason of the pressure of the cam roller 100 as the latterengages the face 109 of the cam and the shoo-fiy fingers 22 are notraised. On the next revolution of the cylinder, the stripper shaft 16 isnot rocked but the stop 106 is left in position to be engaged by stop108 on cam 101, as illustrated in the dotted line position in Fig. 1.Consequently the cam 101 held from swinging and therefore the roller 100as it engages the face 109, is depressed, and fingers 22 lift the edgeof the sheet upon the ends of the stripping fingers 23.

In carrying out my invention it will be apparent that manyalterationsand modifications may be made in the specific structures hereindisclosed without departing from the spirit and scope of the invention.I therefore do not wish to be limited to the precise structuresillustrated and described, but aim to cover all such alterations andmodifications by the terms of the appended claims.

What I claim as new and desire to secure by Letters Patent of the UnitedStates is:

1. Printing press mechanism comprising a cylinder, sheet grippers onsaid cylinder, a gripper shaft, a tumbler on said shaft, gripper pinsfor engaging said tumbler to actuate said shaft, a reciprocating slidingbar having oppositely inclined slots, a guide bar along which saidreciprocating bar travels, pins in said gripper pins extending throughsaid slots, and means for actuating said bar in response to therotations of said cylinder.

2. Printing press mechanism comprising a cylinder, sheet grippers onsaid cylinder, a gripper shaft, a tumbler on said shaft, gripper pinsfor engaging said tumbler to actuate said shaft, a reciprocating slidingbar having oppositely inclined slots, a guide bar along which saidreciprocating bar travels, pins in said gripper pins extending throughsaid slots, an oscillating lever to reciprocate said bar and actuatesaid pins, a wheel rotatable with said cylinder, a. cam shoe on saidoscillating lever, and a cam groove on said wheel for cooperating withsaid shoe to oscillate said lever.

3. Printing press mechanism comprising a cylinder, sheet grippers onsaid cylinder, a gripper shaft and tumbler on said shaft, and a pin forengaging said tumbler, said tumbler having two oppositely disposedopen-ended grooves separated by a central interposed partition andhaving a central conical surface outward of said grooved portions, saidsurface having its conical axis concentric with the axis of said grippershaft, said grooves being for the reception of the pin in normaloperation and said convex surface being to'ward off the pin when engagedwhile not in receiving position and said pin being mounted to yield inresponse to the pressure exerted by said conical face.

st. Printing press mechanism comprising a cylinder, sheet grippers onsaid cylinder, at gripper shaft and tumbler on said shaft, and a pin forengaging said tumbler, said tumbler having two oppositely disposedopen-ended grooves separated by a central interposed partition andhaving a central conical surface outward of said grooved portions, saidsurface having its conical axis concentric with the axis of said grippershaft, said grooves being for the reception of the pin in normaloperation and said convex surface being to ward off the pin when engagedwhile not in receiving posi tion, and said pin having two relativelymovable parts normally held distended by an interposed spring.

5. A tumbler for gripper mechanisms comprising two oppositely disposedpin-engaging slots and a central conical face outward of said slots forwarding 0d the pin when said tumbler is engaged while not in re ceivingposition, said conical face having its conical axis extending at rightangles to the plane of said tumbler and intersecting the same at a pointbetween said slots.

0. Printing press mechanism comprising a gripper pin having twotelescoping parts, a spring interposed between said parts, a pin in onepart cooperating with a slot in the other to limit their relativemovements, and a reciprocating bar for actuating said pin, said barhaving a diagonal slot through which said pin passes.

7. Printing press mechanism comprising a cylinder, sheet grippers,stripping fingers, a gripper shaft, a finger bar, a tumbler on saidshaft, gripper pinsfor engaging said tumbler to actuate said shaft, areciprocating member, means for actuating said reciprocating member inresponse to the rotations of said cylinder, and means acting betweensaid member and bar and pins to actuate said pins and rotate said fingerbar in response to the reciprocations of said member.

8. Printing press mechanism comprising a cylinder, sheet grippers, agripper shaft, stripping fingers, a bar for supporting said fingers, atumbler on said shaft, gripper fingers for engaging said tumbler toactuate said shaft, a reciprocating sliding bar, a guide along whichsaid bar slides, an arm on said finger supporting bar, a link secured tothe outer end of said arm and extending into engagement with saidsliding bar, means for reciprocating said sliding bar in response to therotations of said cylinder,

means on said sliding bar for engaging said link to actuate saidstripping finger bar, and pin-and-slot connections between said slidingbar and said gripper pins to actuate the latter upon the reciprocationsof the former.

9. Printing press mechanism comprising a cylinder, sheet grippers, agripper shaft, stripping fingers, a bar for supporting said fingers, atumbler on said shaft, gripper fingers for engaging said tumbler toactuate said shaft, a reciprocating sliding bar, a guide along whichsaid bar slides, an arm on said finger supporting bar, a link secured tothe outer end of said arm and extending into engagement with saidsliding bar, means on said sliding bar for engaging said link to actuatesaid finger stripping bar, pin-andslot connections between said slidingbar and said gripper pins to actuate the latter upon the reciprocationsof the former, an oscillating lever to reciprocate said sliding bar, aWheel rotatable with said cylinder, a cam shoe on said oscillatinglever, and a cam groove on said Wheel for cooperating with said shoe tooscillate said lever.

10. Printing press mechanism comprising a cylinder, sheet grippers, agripper shaft, stripping fingers, a bar for supporting said fingers, atumbler on said shaft, gripper fingers for engaging said tumbler toactuate said shaft, a reciprocating sliding bar, a guide along whichsaid bar slides, an arm on said finger supporting bar, a link secured tothe outer end of said arm and extending at its free end into engagementwith the upper side of said sliding bar, means for reciprocating saidsliding bar in response to the rotations of said cylinder, a projectionon the upper side of said sliding bar for engaging the free end of saidlink to actuate said stripping finger bar as said sliding bar isactuated, and connections between said sliding bar and said gripper pinsfor actuating the latter as said sliding bar is reciprocated.

11. Printing press mechanism comprising a cylinder, sheet grippers,sheet guides,

stripping fingers, a gripper shaft, a guide bar, a stripping finger bar,a tumbler on said shaft, gripper pins for engaging said tumbler toactuate said shaft, a reciprocating member, means for moving saidrecipro eating member to and fro in response to the rotations of saidcylinder, arms extending from said guide bar and finger barrespectively, links secured to the outer ends of said arms respectivelyand extending into operative engagement with said reciprocating member,means for causing said links to ro tate said guide bar and finger bar assaid member is reciprocated, and connections for actuating said gripperpins in response to the reciprocations of said member.

12. Printing press mechanism comprising a cylinder, sheet grippers, agripper shaft, sheet guides, a guide bar for supporting said guides, atumbler on said shaft, gripper fingers for engaging said tumbler toactuate said shaft,'a reciprocating sliding bar, a guide along whichsaid bar slides, an arm on said guide bar, a link secured to the outerend of said arm and extending at its free end into engagement with theupper side of said sliding bar, means for reciprocating said sliding barin response to the rotations of said cylinder, a projection on the upperside of said sliding bar for engaging the free end of said link toactuate said guide bar to move said sheet guides, a stop for limitingthe downward movement of said sheet guides independently of the positionof said reciprocating sliding bar, and con nections between said slidingbar and said gripper pins to actuate the latter upon the reciprocationsof the former.

In testimony whereof I have hereunto subscribed my name this 10th day ofJ anuary, A. D. 1916.

CYRUS A. MCCAIN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. 0.

